# Mechanics Definitions

For all of you who are sitting this paper on january it's adviced you know those definitions by heart they are worth alot easy marks. I hope this will help.

- Created by: Mustafe
- Created on: 03-12-11 20:16

First 295 words of the document:

Acceleration The rate of change of velocity with

respect to time.

Velocity The rate of change of displacement with

respect to time

Displacement The distance travelled by an object in a

particular direction

Speed Distance travel by an object without a

given direction

Newton One newton is the force that will give a

mass of 1kg an acceleration of 1ms-2 in

the direction of the force

Weight Mass X velocity

Newton's first law An object will remain at rest or in a state

of uniform motion unless it's acted on by

an external force

Newton's second law F=ma The net force acting on object is directly

proportional to the momentum of that

object

Mass Is a measure of an objects inertia (mass

of an object increases as it approaches

the speed of light)

Vector Is a quantity that has direction and

magnitude

Moment of a force Force X perpendicular distance of the

pivot from the line of action of the force

Principal of moment For any object that is in equilibrium the

sum of the clockwise moment about any

point provided by the force acting on the

object is equal to sum of the

anticlockwise moment about the same

point.

Torque of a couple One of the forces X perpendicular

distance between the forces

For an object in equilibrium two (1) The resultant force on the object is

conditions must be met at the zero

same time (2) The resultant torque must be zero

Density = Mass/ volume

Pressure P=normal force/Cross sectional area

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